| 主权项 |
1. A grinding apparatus comprising:
a receptacle having an receptacle inner wall defining a receptacle cavity, said receptacle inner wall being in the general form of a surface of revolution extending about a central vertically extending receptacle axis, said receptacle being rotatable about said receptacle axis; a grinding element having an grinding element outer wall in the general form of a surface of revolution extending about a central vertically extending grinding element axis, said grinding element axis being generally parallel to said receptacle axis, and offset from said receptacle axis by an offset distance, said receptacle inner wall and said grinding element outer wall together defining a grinding chamber within said receptacle cavity, said grinding chamber having a generally annular cross-section; and a drive means adapted to rotationally drive said grinding element about said grinding element axis and/or to rotationally drive said receptacle about said receptacle axis. |
